Iowa Environmental Mesonet Search for Warnings SPC Watches VTEC Browser Webcams Webcam Mainpage Still Images Hi res Live Loops Recent Movies Cool Lapses Related IEM Apps Index IEM Daily Features by week IEM Feature Tags IEM News IEM News Feed RSS Past IEM Features The Iowa Environmental Mesonet IEM collects environmental data from cooperating members with observing networks The data are stored and made available on this website Ag Weather NWS Users Researchers IEM Daily Feature Facebook Permalink Past Features Tags Generate This Chart on Website April Temps Winds Posted 18 Apr 2016 05 38 AM Tags apr Outside of having breezy conditions again temperatures this past weekend were spectacular with highs well into the 70s and even some lower 80s in the state The featured chart displays the frequency of having a 10 knot wind speed reported at a given temperature in April If you want the warm temperatures we experienced this past weekend then you ll have to take the breezy conditions as well The windy conditions are what help to drive the warm temperatures by transporting warmer air into the state and mixing down warmer air from above in the lower atmosphere Rate Feature Good 7 votes Bad 0 votes Abstain 1 votes Previous Years Features 2014 Seven Sundays of Rain 2013 Big Rain Event 2012 Record Pace of Warm Days 2011 Busier than last year 2008 April rain 2007 What is normal for today 2006 Back in the Slight Risk 2005 More like August 2003 Hop Hop Hop 2002 Wild Weather Ride Independence IA Webcam View other webcams Most Popular List Apps Automated Data Plotting Climodat Reports Iowa Mesonet Plot Loop Current NEXRAD Loop IEM GIS Rainfall Sortable Currents View Storm Reports on Map Winter Storms of 2015 2016 News Items November COOP Data Uploaded Posted 13 Apr 03

IEM :: Archived Data Resources only base reflectivity was saved IEM 2 day Level II Archive The IEM maintains an archive of Level II data for roughly the past two days NCDC Complete NEXRAD archive This is the one stop place for historical Level II and Level III NEXRAD information A wonderful site Texas Mesonet LEVEL II archive Past 30 days of Level II data for all NEXRAD sites Texas Mesonet LEVEL III archive Past 30 days of Level III data for all NEXRAD sites GIS NEXRAD Composites Composites of NEXRAD base reflectivity The raw files are found in the general IEM archive in the sub directory called GIS uscomp Single Site NIDS Imagery You can generate images from their online archive Satellite NOAA Satellite and Information Service A wonderful site to download historical satellite data NSSL Storm Tracker Current and archived satellite imagery along with some derived products NWS Text Products The IEM archives all NWS issued text products Unfortunately the we don t have this full archive online yet NCDC has a big archive of this data back to 2001 The IEM s archives can be found AFOS Product Finder If you know what you are looking for this app works great Simple directory listing Certain warning type products can be found in the main IEM data archive directory structure List Products by WFO by Date View quick listings of issued products by forecast office and by date NWS Record Event Reports Daily reports of record temperatures and precipitation for Iowa since November 2001 Raw Data Bufkit archives Iowa Only The general IEM data archive contains a sub directory called bufkit This directory contains model point soundings for locations near Iowa The archive started 25 January 2006 27 March 2015 Mtarchive Bufkit Archive This archive contains data for many more sites and models including SREF GEMPAK data archive Archive of gempak products taken from the UNIDATA NOAAPORT feed This archive dates back to 2001 and for some dates even further IEM Network Data IEM data in its original unprocessed form ASOS AWOS METAR observation RWIS comma deliminated data schoolnet csv data SCAN site format and COOP observations Unidata IDD 6 month archive Archive of raw data provided by Unidata for the past 6 months NCDC NOMADS Big Archive Lots of raw model data and other goodies a definite must visit Misc Archived IEM Product Browser This time machine interface allows for quick browsing of IEM Products NWS DIFAX Archive 2000 Excellent archive of the NWS DIFAX products Precipitable Water Climatologies Fascinating month by month plots of PWAT climatologies for the RAOB sites in the CONUS UCAR plot archive Assorted RADAR satellite and model plots back to 1998 IEM Generated Plots Images and data products mostly displayed in real time on the current data page Iowa Mesonet plots hourly precip plots mesonet stats and COOP precip plots are examples IEM Data in GEMPAK Format IEM surface data in GEMPAK format Data files exist with different combinations of IEM networks Model MOS Archive NWS archive

IEM :: Reanalysis Data Images Hi res Live Loops Recent Movies Cool Lapses IEM Reanalysis IEMRE IEM Reanalysis is an effort to provide a regular dataset of Iowa Environmental Data without many of the problems associated with single site observations The IEM will continue to provide single site observational data but for some purposes this dataset will be easier to work with No dataset is perfect and this dataset is provided without warranty Why do this Previously the IEM has only provided raw observations with limited quality control checks in place Quality control is hard Many times users are simply looking for something close and perhaps not as perfect as high quality sensor observations can be Producing a gridded analysis is one way to produce a dataset from point observations which can be sampled as a means of spatial interpolation Isn t this a duplication of effort While there are other reanalysis type projects out there with data freely available many times their data does not update in near real time and does not include many of the datasets the IEM uniquely collects We may also produce an analysis on sub hourly timescales Data Flow 1 Input Datasets NCEP Stage IV Precipitation This is an hourly gridded product with precipitation estimates derived by RADAR and then bias corrected by gauge data The IEM caches the grib data and makes hourly plots available here MRMS Precipitation Currently this is only used to populate a daily total in a dedicated netcdf file ASOS AWOS Daily Summaries NWS Daily Climate Summaries HRRR MERRA NARR Daily Solar Radiation NWS COOPerative Observations Manually QC d Iowa COOP data from Iowa s State Climatologist NCDC QC d COOP Data 2 IEM ReAnalysis Gridded Datasets Daily Maps of Gridded Variables View a smoothed or gridded plot of IEMRE data Download the